Fix some of the issues reported by LLVM/clang's scan-build

Corresponding to flashrom svn r722.

Signed-off-by: Stefan Reinauer <stepan@coresystems.de>

This commit fixes only some of the issues, those that were
Acked-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
diff --git a/sst28sf040.c b/sst28sf040.c
index d3d7bdb..930ad5b 100644
--- a/sst28sf040.c
+++ b/sst28sf040.c
@@ -30,28 +30,24 @@
 
 static void protect_28sf040(chipaddr bios)
 {
-	uint8_t tmp;
-
-	tmp = chip_readb(bios + 0x1823);
-	tmp = chip_readb(bios + 0x1820);
-	tmp = chip_readb(bios + 0x1822);
-	tmp = chip_readb(bios + 0x0418);
-	tmp = chip_readb(bios + 0x041B);
-	tmp = chip_readb(bios + 0x0419);
-	tmp = chip_readb(bios + 0x040A);
+	chip_readb(bios + 0x1823);
+	chip_readb(bios + 0x1820);
+	chip_readb(bios + 0x1822);
+	chip_readb(bios + 0x0418);
+	chip_readb(bios + 0x041B);
+	chip_readb(bios + 0x0419);
+	chip_readb(bios + 0x040A);
 }
 
 static void unprotect_28sf040(chipaddr bios)
 {
-	uint8_t tmp;
-
-	tmp = chip_readb(bios + 0x1823);
-	tmp = chip_readb(bios + 0x1820);
-	tmp = chip_readb(bios + 0x1822);
-	tmp = chip_readb(bios + 0x0418);
-	tmp = chip_readb(bios + 0x041B);
-	tmp = chip_readb(bios + 0x0419);
-	tmp = chip_readb(bios + 0x041A);
+	chip_readb(bios + 0x1823);
+	chip_readb(bios + 0x1820);
+	chip_readb(bios + 0x1822);
+	chip_readb(bios + 0x0418);
+	chip_readb(bios + 0x041B);
+	chip_readb(bios + 0x0419);
+	chip_readb(bios + 0x041A);
 }
 
 static int erase_sector_28sf040(struct flashchip *flash, unsigned long address, int sector_size)